Date: Thu, 12 Nov 2015 14:12:20 -0500
From: Johannes Weiner <hannes@cmpxchg.org>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>, David Miller <davem@davemloft.net>,
        akpm@linux-foundation.org, vdavydov@virtuozzo.com, tj@kernel.org,
        netdev@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/8] mm: memcontrol: account socket memory on unified
 hierarchy
Message-ID: <20151112191220.GA25750@cmpxchg.org>
References: <20151029152546.GG23598@dhcp22.suse.cz>
 <20151029161009.GA9160@cmpxchg.org>
 <20151104104239.GG29607@dhcp22.suse.cz>
 <20151104195037.GA6872@cmpxchg.org>
 <20151105144002.GB15111@dhcp22.suse.cz>
 <20151105205522.GA1067@cmpxchg.org>
 <20151105225200.GA5432@cmpxchg.org>
 <20151106105724.GG4390@dhcp22.suse.cz>
 <20151106161953.GA7813@cmpxchg.org>
 <20151112183620.GC14880@techsingularity.net>
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On Thu, Nov 12, 2015 at 06:36:20PM +0000, Mel Gorman wrote:
> Bottom line, there is legimate confusion over whether cgroup controllers
> are going to be enabled by default or not in the future. If they are
> enabled by default, there is a non-zero cost to that and a change in
> semantics that people may or may not be surprised by.

Thanks for elaborating, Mel.

My understanding is that this is a plain bug. I don't think anybody
wants to put costs without benefits on their users.

But I'll keep an eye on these reports, and I'll work with the systemd
people should issues with the kernel interface materialize that would
force them to enable resource control prematurely.
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